1. The economic implications of learning-by-doing;Arrow;Review of Economic Studies,1962
2. The Practice of Econometrics: Classic and Contemporary;Berndt,1991
3. BWEA (2004), Historical Note on NFFO. British Wind Energy Association, downloaded from www.bwea.com/ref/nffo.html.
4. Building Options for UK Renewable Energy;Carbon Trust,2003
5. ‘Analysis of Wind Turbine Cost Reductions: the Role of Research and Development and Cumulative Production’, Presented at AWEA Windpower 1999 Conference;Cory,1999